Depends on the brand.

Most the time your cost is higher just for brining it in. Minimum service charge is often larger then the cost of the repair, but again it depends on the machine itself (as well as the shop).

I've been doing it for almost 20 years (from board level repair to software support).

Some shops may have the right part, and tell you how to fix it yourself. Some insist that you cannot do it, and it will take their "specialist" to repair it.